As someone who has been wearing "Smart Wool" wool socks for many years, I ordered a pair of Grip6. I wear a size-12 shoe, so I ordered a Large pair (which is typical for me). They were way too small. Grip6 easily exchanged them for an XL pair, which fits properly, but for an American-made product, the sizing should be accurate (and there's no way an XL pair will properly fit a size-15, as the sizing chart says). The shaft of the sock should also be slightly (maybe 1") higher. New companies become successful by making customers feel like they are getting more for their money, not a barely-adequate product.